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Ann [662]
2 years ago
14

MULTIPLE CHOICE:

Biology
1 answer:
MariettaO [177]2 years ago
5 0
D. Surface tension surface tension it’s what makes insect walk on water
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The cichlid Cynotilapia afra, introduced at West Thumbi Island in Lake Malawi in the 1960s, has split into two genetically disti
Valentin [98]
<h2>Concept of biological species</h2>

Explanation:

  • Determine whether peoples from one populace will interbreed with people from the other populace when brought into one another's local environments
  • An animal category is a gathering of individual living beings that interbreed and produce fruitful, practical posterity. As indicated by this definition, one species is recognized from another when, in nature, it isn't feasible for matings between people from every specie to create prolific posterity
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3 0
3 years ago
What second messenger most directly causes calcium ions to be released from intracellular stores?
NemiM [27]

Answer: adenylyl cyclase inositol triphosphate mainly known as IP3 causes the release of Calcium ions directly from the inracellular stores and causea contraction.

Explanation:

IP3, inositol phosphate is a second messenger a signaling molecule. It is made by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid that is located in the plasma membrane, by an enzyme phospholipase C.

IP3 binds to the calcium channels and opens Ca2+ channels that are embedded in the ER membrane, releasing Ca2+ into the cytosol. Calcium ions released may cause contraction and regulate the Ca2+ channels in the membranes.

6 0
2 years ago
How does phloem differ from xylem?
Pani-rosa [81]

Phloem is the food conducting tissue that has a two-way flow.

Explanation:

Plants prepare food on their own and plants also have conductive cells that carry out transportation process. Plants are divided into two types based on their conductive system i.) vascular plants  ii.) non vascular plants.

Vascular plants are those plants which have special conductive cells called phloem and xylem.

Xylem transports water from roots of the plants to other parts of plants and also provides mechanical support to plant. It is uni-directional.

Phloem is the food conducting tissue that transports food to plant and also have bi-directional movement.

7 0
2 years ago
In which location will you see polaris at the highest altitude in the sky
icang [17]
The location northward the Polaris climbs higher in the sky.
3 0
3 years ago
Read 2 more answers
State the difference between the two methods.​
Alchen [17]

Answer:

They look different

Explanation: Look at them. Yes ok good

3 0
2 years ago
Read 2 more answers
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